Diesel was a 7-year-old Malinois, also called a Belgian shepherd dog.
In a post on Twitter, French police say diesel was "killed by terrorists in the ongoing operation."
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It's believed the dog was the first to go into the apartment where it was believed terrorist suspects were hiding out.
According to unconfirmed reports, Diesel died when a female suspect wearing a suicide vest blew herself up.
CNN Newsource contributed to this story.